Any progress on this one? I'm working on a similar project using a jig saw head I found on eBay. Of all things, I saw this idea on the Yahoo Unimat group, went to eBay and found the jig saw head!
This is on a smaller scale, and I intend to make an overarm using a section of a power hacksaw blade for the spring arm. I'll be watching your build for ideas. I need to scrounge up a proper bit of metal for the table and of course make a mount for the gearbox on the ways.
Oh, my intention for this is to use it as a scroll saw, but now I see it can also be a filer.